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외단열 고정 방법에 따른 접착강도 기준의 제정 방안에 관한 연구
박완구(Park, Wan-Goo),박진상(Park, Jin-Sang),송제영(Song, Je-Yeoung),오상근(Oh, Sang-Geun) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.1
Energy issues is accelerated. As a result, insulation method is being applied actively in the buildings. External insulation method is efficient batter than other insulation method and it is applied on the external wall of the building actively. Apply method of external Insulation is divided Wet Construction, Dry Construction, Semi-Dry Construction. Wet Construction is adhesion method on the buildings using mortar of adhesion. Dry Construction is adhesion method on the buildings using anchor except water. Finally, Semi-dry Construction is adhesion method on the buildings using anchor + mortar. But When the strong wind blows, method of external Insulation is occurring problem of drop out in the rainy season. Therefore, this research progress enactment plan of standard of bonding strength in bonding part of external insulation method of wet construction, dry construction, semi-dry construction. The results of this research, Adhesion of Semi-Dry Construction is best than other methods. Should try to use based on the adhesion strength standard on the basis of the results as described above.
대륜계통의 고온적응성 분홍색 반겹꽃 거베라 신품종 ‘Harmony’
박상근(Sang Kun Park),임진희(Jin Hee Lim),최성열(Seong Youl Choi),신학기(Hak Ki Shin),허은주(Yeun Joo Huh) 한국원예학회 2013 원예과학기술지 Vol.31 No.2
국립원예특작과학원에서는 2010년 거베라 신품종 ‘Harmony’를 육성하였다. ‘Harmony’는 2007년 분홍색 반겹꽃 ‘Pavilov’와 자주색 반겹꽃 ‘Marathon’을 교배하여 얻은 실생계통으로부터 2007년부터 2010년까지 4년 동안의 생육특성검정을 거쳐 선발된 절화용 품종이다. 꽃은 암갈심의 밝은 분홍색(RHS R49B)으로,평균 직경이 11.8㎝인 반겹꽃 대륜계통이다. 화경장이 59.2㎝로 매우 길며, 꽃목 직경은 3.9㎜ 굵다. 절화수명은 12.0일로 대조품종에 비해 3일 이상 길며, 연간 채화량도 57.0본/주로 대조품종보다 10.5본/주 더 많은 다수성 품종이다. A new gerbera cultivar ‘Harmony’ was bred by the National Institute of Horticultural & Herbal Science in 2010. ‘Pavilov’ with pink and ‘Marathon’ with purple, which have semi-double flower, were crossed in 2007. After investigation of the characteristics for four years (from 2007 to 2010), it was selected specially for the use as a cut flower. The ‘Harmony’ had brilliant pink color (RHS R49B) with dark brown center. The flower was semi-doubled with 11.8 ㎝ in diameter. It had a long and thick peduncle with length and upper width 59.2 ㎝ and 3.9 ㎜, respectively. The vase life of ‘Harmony’ was 12.0 days, which was 3 days longer than the control cultivar. And its average yield was 57.0 stems per plant, which were 10.5 stems more than the control.
폴리우레아 방수재의 탄소섬유함량에 따른 내열성능 변화추이 연구
박완구 ( Park Wan-goo ),박진상 ( Park Jin-sang ),최수영 ( Choi Su-young ),김동범 ( Kim Dong-bum ),김병일 ( Kim Byoung-il ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
This study investigates the effect of improving the heat resistance performance when carbon fiber is mixed in the polyurea coating material. A tensile strength test method was carried out with the carbon fiber mixed polyurea specimens at an interval of 7, 14, and 21 days after heat treatment at 140±2℃. The test results showed that there was a significant decrease in the tensile strength performance. While the elongation and tensile performance decreased greatly, it was confirmed nevertheless the overall performance was maintained. This study proposes that mixing carbon fiber to the polyurea resin can effectively secure long-term heat resistance, thereby solving the problem of deterioration of physical properties caused by exposure to ultraviolet rays.
근사 최적화 기법을 이용한 펀치 단조품의 예비성형체 설계
박상근(Park, Sangkun) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.7
본 연구는 본 연구에서 제안하는 근사 최적화 방법(메타모델 기반의 시뮬레이션 최적화)을 사용하여 저렴한 해석 비용으로 펀치 단조품의 예비성형체(preform)를 설계한다. 본 연구에서 사용한 설계목표는 유효변형률의 균일한 분포이고 설계변수는 예비성형체 치수이며, 구속조건으로 최대 미충진 비율을 사용한다. 이를 위해 먼저 예비성형펀치(반재), 마스터펀치(상부다이) 및 하부다이로 구성되는 단조성형 공정을 DEFORM 시뮬레이션에 의해 모사하고, 이 시뮬레이션 결과가 실제 단조 공정을 모사하고 있는지 확인하는 검증 방법에 관해 소개한다. 또한 본 연구에서 수행한 설계 최적화 과정, 즉 (i) 초기 메타모델의 생성, (ii) 메타모델의 최적화 수행, (iii) 메타모델 최적해의 검증, (iv) 메타모델의 개선에 관하여 상세히 기술한다. In this paper, attempts were made to design a preform for a final punch inexpensively using the proposed approximate optimization method or metamodel-based simulation optimization. The design objective of this work is to achieve a uniform distribution of effective strains, the angle dimension of the preformed punch is chosen as a design variable, and maximum underfill ratio is used as a constraint. For this optimization, a computer simulation of a practical punch forging process is run using DEFORM software, in which a preformed punch(workpiece), a master punch(upper die), and a bottom die are dealt with. A validation method is introduced to determine if the simulation results match the actual forging process. In addition, this work presents the detailed design optimization procedure consisting of (i) generation of an initial metamodel, (ii) metamodel optimization, (iii) validation of metamodel-predicted optimum, and (iv) metamodel improvement.